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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1cb85a2eb85ae03c0588631069d42f887fcc4fe5f496a60bb53aa3e22ee61467' 
  AND token = 'Yqtrwamj+TI09h6BQoQDrFvanEDYwOq9rYOftxwYOc8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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