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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '44d3ea4b23533a899205d64959b5fedee9434e0abf090a7ad157c191d2e1fafa' 
  AND token = 'uuFJ8iaGzXtD8cUIZROq4D7mBH+ehME5eqgkgwghEhk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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