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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '982783e7e22041cfa7425f05efa9ac0bd7743f1c31a9e787298b5f7cdf8bab46' 
  AND token = 'Q5NmQqt2YtlnwNS2acjTsMsgfj+o8IF7bujaGCk1WQg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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