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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1de2f06502957cb020594d27b5ec1cebb0a670883c843ea79ae25332ea404352' 
  AND token = 'Kq0TTD9fLSfmQavQ1KRGRzyqUHu4ZaTKz9T75Q5P/gQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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