SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a0d88a35689f86efa24a67e48481d1d402801118855c16e96217336110d3c62f' 
  AND token = 'SL8Swm7EsD+OFCBfXNCU4jsTwl0aAdrKBvY6q8EZzgw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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