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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '83959543a867911e075d7e8f5a5eca961075460b153dc68378832a7602e1c758' 
  AND token = '7yHgfrb+pc/XfnFJc2e5htLbUOnni0MdvZTkhP5w67o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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