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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '40d9b73e957d1159dd2ced1498596aae17098b7162d2c426425e7e6e0c70b0bc' 
  AND token = 'e+UrLOfSOrHSZzoyT9TWanhot+aVFXOFCy2cNHlaS9g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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