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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '26ab5d48212bfbc0a52ea9e7a7a8a8aaa8f6c8db28e810fcb62304ec06842561' 
  AND token = 'aPvANV3Xhiz84OkYvHm/SJgIZYSOgYGNhEiVZaoTbsE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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