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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd0dd0e9cf39ff6b31d6620a69e221f725fbe5cca36ebd3128b64eb6724f8171a' 
  AND token = 'ee0QrQIvkZ6cXvhFTOgvZIUhmYqYRqNi6kYluyOzPa8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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