SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'eed4c22e563c622698f6fd54665d454a341c779a3723af2a0b4374b800cb4db8' 
  AND token = '/5+r/3YFVYVha9zLvKd5yoLFwOlKT08CpQNy4umDBQA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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