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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7520f60827d6230e179b581d69eee414da818819bac3ff77568bc211c8f9c92b' 
  AND token = '/DOvMg+yP7JpgKd0AEcBJPEmKlxudg7ods2PvUuiPgc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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