SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b89ec873e4ca35294e1436342d86b93dc0b4502c4f19da7f2e26b0af587739d6' 
  AND token = 'm2w1dBzEl1fN/fGTZ35x4EuMS/ECy/1hyCjaJghvZrM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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