SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b81e613b8e07ca74b14da78afb7ef0ebb1c26dba2933bf2d12590c4c9b96ac64' 
  AND token = 'zhcuA2p1BtQuvpRGSISg8x5XQ5RLZqsySI/q2a1hrV4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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