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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b0cd3ef14684e845049764eba2ff8705dc0f6eb62d9ea2b10ae536cb6bfa0026' 
  AND token = 'gpJ+pXguEEhB4dDiekdwxTOdSA5vghEblzKRn0Pp08Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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