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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '72eb693f895d691cd26da0a48e994b7066f5d97ea833432d6f1cbc5e01483cfc' 
  AND token = '98RvjennLxXv9yyGkPabqzqL6ke6mvwE1liYtfKCcdY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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