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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3f882dcb128a147b752011c95fc5e33d917ed684f67244d97e16793dc11395d9' 
  AND token = '1vpUxQOPjLRm3PX+TMuH6NepyRuP16yMLu5O/lBqKM4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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