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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c6765df0fcf06ac5d40692088bec77395a3b8cba0ba06d6692ffef08e80f47b8' 
  AND token = 'DEj66ODPm8mZHtMrVcAjoml13jiDyc+2OqRpoyTacVs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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