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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3fc52141db360027c6044035d803383ec25b4585886c1c35605af0c4e8741973' 
  AND token = 'n3gujYFLOcKHcKVXmLb2EvXKxGSXSeTT9XYDWB4lCeY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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