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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '26631e8ba1892e5a32f4696c66d3982465b88bb2f7ef61eea53f6b4e13556a62' 
  AND token = 'SGs3HvurtWFa0lu1Njvlvagz87hG8VqGtZgGCM9rbUE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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