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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8657bc45045c06b52ccee073dffe717588c594b4e685a5cab7073db9f8276ed5' 
  AND token = '++kJv7VijJO4k5YvjL14hCB2dor1c/Me4MJOBQBjKBs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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