SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'fd3ed8ae3c79110800cb9ce01ab92e71ad859b65db88f7a8afe048e2960021a0' 
  AND token = 'veLjGrqB4JaZ3wsdhNzhKJhXNSXWHMnn6yEVmDvezj8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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