SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c7225841c47839a479f8ffddf74ff6ba6219f127669c1f43754202c6890aedea' 
  AND token = 'ba8bqfK8kNWvTo4pmPht8YhlrV2IkGxRZloReLJ/yh0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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