SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '35f6bd5ec238f86f140544c3cefe5beb77e14589b326122d58fd2b276533881e' 
  AND token = 'K0Z5owHLicFIvXkIGsDmxQYXjty3iuI2xqVnQIsTaiY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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