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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1645b5d387ea30eb37d72c6c5d533b948fad4128f8ebaa3c74cdda4bc1ab1f98' 
  AND token = 'JDBwC5D1p7rSvcjlDgIejcUW6Z2LkXrQUmUW1PtzJb4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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