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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ed2439658b678e6a0e8b24d59035cb1176c8ccf5203aa30a9b44c6354e15d4fd' 
  AND token = 'SvrG/rhektNrCrxFf7Ibvb9EzZiunrRxyyVL/uRGQiE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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