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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4dbb12ca7427353c1ef5c60cb880ce476e744a756de355b63fa24ad8d99e04bc' 
  AND token = 'jQbOibfroNNV6ScMaqdMR4unEoM9kNkIYC9UU0EXM9Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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