Sandbox

SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b88266707e9e906eccaf005f0e87a91c0bf7fb9bd92978f34f06f371d9e2108a' 
  AND token = 'QRJl8/T50c+5tfsM1Z6DHTZ8KXLXduylGWsSDkVGbSE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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