SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '12ec9a2b28574f6393dc826ae45ae0c8451981997c73c0515109752788001aa6' 
  AND token = 'aXyqp7MjCIs+WffxR5MPzhm4X+QYyukH548bgVUdiQE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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