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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5a9cab778f646c16e7ff039a199131f782fb60b8a448dad4d0870a6d5bacfabf' 
  AND token = 'hAokEufTtK5/86u6xOwz2gB4ony5CN1bHCDB7D+bnjs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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