SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '26ca4248d3923535d64844cc125aad326af52ecacbcb71c66771d4f6765d4c13' 
  AND token = 'y+PpgTJ+i8Xw9jvU5jdQwutWf7SyymHAVKB0MhmUgl0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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