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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '89fe0483fc0c4342c40b3f872558437e59c0a1e89a313b2419252acf6f389a73' 
  AND token = 'pI9Fbc5DvF0YGO3u8qiF8E3pMFA8/zJBzhqv4Igfjvc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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