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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '431ca0ca199381cbbb4cb4cca64b6568ced86e2eae4be4fcaeb9fdf526c90afa' 
  AND token = 'iIT1Q08q9xDdSG+aQOQ0Z6qv9MWb15naedlue/zPr1s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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