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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a4e7537c646eeae1d7b54d4c6513d3a08a3e3202a5b6b8ce0e67d5d52ef370f6' 
  AND token = 'Gmf2FqC4uS9kkf9iZS4k4WPmnrZIqAaEjhp9OXQRa5w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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