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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '82b9233d6d9c93ede3fedd0371654139762916fae4eac5effd08c67f10d4e040' 
  AND token = '6jy7RHqwYMlCGznQF99deMJ9qP4et8OJJbghKf+xkM0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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