SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9710d0fc2eeb4942e8755097d4d885961aa457d81a03c699fbc512535405230a' 
  AND token = 'waElrUHDMqjlCZ2sXUZQFemgcYmEhJZKT7gwn5PXfhE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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