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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b08048bfb47d9fe5eb751efa5b87bd892a5c50798e2906ec0685089bcba65419' 
  AND token = 'm8MLXt7p3EsoWDC3yNeDBzxH3H+N1iyPA4rG1b483lE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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