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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e7e24fd6db7bcaf66623c17a01621d712a020f650e4db19c1f7aed7c23ca3fc4' 
  AND token = 'xMFYP/xbW3cYDFVczucDkxUPj6kn9qgHy9216vE6WnI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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