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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7d40c55ad65ae60e8f2cbcfaea9947a8a21afb961e03f7faea92bdca8691af26' 
  AND token = 'X0L0TvFav21RGBQjGsFhWOrNohk3tlp0ck5EvJ07StE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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