SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'cbcb91a6e916c5e93e5bdc3045016062f78bba53e997de263e17b6649b7da620' 
  AND token = 'jPX20rAvB4h7Zg6HUfzVGFgZLeuwlWquevJyDSE/Uzg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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