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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0c42f3d4f4e2dd29ffab833e83545cd27749576f8ad743323faf452b877049af' 
  AND token = 'ipdt6FAKrhur5+9337ck40a8eZ/QEuTbORBbRLxTBhg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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