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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '88ad63d7d34de737e5a22608ffafd8b6d5e68f251e52cbde13a6a7f6ac2b306b' 
  AND token = 'NEMrQcQy7fSLis9vQBad/ink9r+6KBeRhuYtmBY9sw0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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