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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5157aed7a67a1ed183b25790dcae57aaafdf6d9265f3adeb28f607ab86cc2292' 
  AND token = 'aoS5ezc3P/7fDtD3MP3UPXib3D0I6zT+AUdzy3qESyY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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