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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '09209bf7ae73ec6c27b7b976e3e1be74850f5c4ea11a6d5845d033f5bebb2f21' 
  AND token = '4QgVFFHtcnmidsir7cfjQDLLosSCJdKGWNgODuQG73M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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