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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd4a58b7275623f2e55142a5ea5f9b6c90aa5328e8b629daab01b4faa9bf2f4d9' 
  AND token = '3xcH6SIMRt5S7sQiSAxDY+NZe1+RBEhO/qGrjueyjLw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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