SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a336d82e72fd4186162ea3667d13e9672f9f0a929743c616ef89c7a4a54499d3' 
  AND token = 'Ro8PdHXjWRDVl9vGHKBOvpw4wgqxlGNgylPnxKFzOsg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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