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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd3d8f06f09961da58d160852a4517882284d64c2ffead94d7d53e6f8416eea0f' 
  AND token = 'xXPJa11QfmOIjKjIt5xpWIgM6wtvGUrtfnwFQjzmNDo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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