SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9883c39e2e2d59861460f1e807d61a3ad82ae2fff59f14008bb7e519604a1e27' 
  AND token = '745BTFnn1Jpja0MtV9B+DZ1i1CKKPUeLTagXCDXvXTY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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