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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a3b50fe736ca2476f34ddd6f7b9ae0d4c2c966b667c205de784aee157340f677' 
  AND token = 'BgK8+5GiQEM3jLASLIXAS6r/IZUhKvSm4CGUgIcS054=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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