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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f0832ce76a990320000595a9e4901e774dff0893a7b86e7083ef574c763d2a9f' 
  AND token = 'dDB0tKHOiaHDdP7arHQUFfG9rVjuT8VqdFouzLGQoXw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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