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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3be8d27c3ceb675c4d3d7419111cb67d3da41df7e16beb4af45e45da3d2ed5df' 
  AND token = 'drLv5igJQeUnYruDoR9YOb79LGjbpOxvz4KeZFZqBRw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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