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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3fc2dc554c03d2c2af06e406707a4e3f50aa0747fab686baef9db6a53fef108b' 
  AND token = '+SD4iz5T0fs9WEj1z6P/McyrpmB7M2dQ+7Dpp3LskDU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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