SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '932ff6808a9d0c8608b7f50ff1072e1e47dd18bb3e9aeeafd64e7a421f2c47de' 
  AND token = '/H1nY3EB+HewmiPozTzl/HwiqcroRJ/L25G3pzsYAjM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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