SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c0d0e7366642958d51e16c77f9267ca4b03add171bffad0c75e7b4d8350ba333' 
  AND token = 'T4KkzIJoGzV7pKUXVXCkqhykq7Pw9LCmJolZWxyGccU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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