SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7baa523c424af7bd67edbcf785247d3968578e8fa993fc9b612a61d12be2bdeb' 
  AND token = 'ri1GYQwcNHyJCcqaYB6kqkkk6UxAV+RoEVW47gh0zso=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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