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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c022d654488b50458b8740dcee1c82cc3296cac8d3b08418b91d88d5644d65a3' 
  AND token = 'TWhjabnZMSYtZTgITmxlEnojdXd0v/wQu1HxyqTkQDc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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