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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '89afb69fb0b1b28b772573a19d1813a224436b806bb11ea95180e6a18e0bdeaf' 
  AND token = '5SHv9dNk6Ii3RrV6t4vGWeCzfEiL2dHCq9eUZzRSyvs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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