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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '44a2bb8fd08aac222cb8719cf6073aef7812dfb9880528b8f2451b54e3c37d33' 
  AND token = 'MBPfjYqol+2caDAfmwXERX6dW2+JeralJpQyfYBunLU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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