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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7c0a3fe33d75a47497287aef63005439053c65cff6373f253ff4349034d68fdd' 
  AND token = 'yU8M7BOJgZuHfepUhuXPZ7vJ7kOlAuiCgfQLvVcVx1k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}