SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd85b8de8e35a7263f2c94088d6a8f05592f1603521854dd8d6304fa05381f585' 
  AND token = 'pudXU/4wOO4o9HyUzhs5dvLZWl9cY7x1BbrV+jOMYs4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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