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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5068495585e98a64bd8c79cbd4e149f611bafcfbc8c76c0e1d9cd5163c604aae' 
  AND token = 'vnH6lHVcR5QArgFZ3D/gFPuSzX4teixwJ9ZgNC4W24o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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