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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '16992c9059aae208fccfe0c734dc818ac1bcbefd7e5f91b5036f17dd3e4f5307' 
  AND token = 'nHaXmUCwyZUM1mI3ZkZPtsEvRTNQUuhXTfpIU0F6Vag=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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