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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'dc889ae89ee4ee6d5202fc2e3af24b1c55887074522bae8253cc6b165f07c74d' 
  AND token = 'rrX1ZjA3zDL4T4ygV0N6kTOwPenxXKzEFRzxiBsIizY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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