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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '923a5fc50b2dddaed33e737673526d31ea488863ba9af50d7eb1c7082b9d0ff7' 
  AND token = 'VQqqa2U86CGSdnzsIKVja6ZB6DCIO/5ZLtu33K90fTc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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