SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e1a846d0a352903cc845b0bf98a6ec76ba55647a601f47f73d21c379a4c9fe05' 
  AND token = 'AUHBtlE7vmxXuzVJjzGj24RqWCNnFOBSKmB8+Ar2MWI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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