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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ed20afdfd2f2c79b35820ef174232a44a7a8649151bac329253f749542296944' 
  AND token = '9dXiv2WEpiD5BstyLqWF0Kjb+cq7hsAtY8WSkcfjCxA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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