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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b4a07da881d111101ca5b90911ededab9db837d76318de5ca172d7450c6c7507' 
  AND token = 'lwGga5UokLw3QiU0SuHb93ruMk3TlJ6fzXlK4OWrJBg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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