SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b4447f40dcea9ffea898724e6dca7505ca418693594eb3b716efe265bbcbc37d' 
  AND token = 'VdnUP3c0npAunQ6+qOpXgSRi5GJwvNRR2bVFtz6wmlg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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