SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7265bb297fcbcc766ffac39e7f9e4945238901db464a7eec4bff947d48938e7c' 
  AND token = 'pFaNBqrs6Q+zOBIuNUqSYZV+Bq9/sYy4+YFg/cixE3c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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