SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4f33ca2a71d9b34784dc1fe7cf5138170d0ede39c45895e49e9418f57217a2b1' 
  AND token = 'G4QsjrkLkBVVjUP89YiLoYWwJ91wQurfHgyMw6fUDAg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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