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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '13d543502a91682a2c969ecc57fbdc03f4c3a0cab053735a2391b270d16939c5' 
  AND token = '32ceHGlzO71O8XNhn6fSNrDCpbHE6KVm/3Yc1uZGblA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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