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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f806c2b9f220b379782a656884c301db62070d405363931c5fc7aaa2433aee88' 
  AND token = '1V26riimguyaZ7rCh4fNsl9gh0ZaqPFRH/3xY5bs1kM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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