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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '11cf75f17590f948142516d6a11b48356a74176ebbbf77b6c3bea7556dac571d' 
  AND token = '2hVZH4TvaK5QUZ5KZZASKknRLUQohA7AQ+p5gr9PZG8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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