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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '47e2c85e612a65be60129b837e5756e3917602e155e0938fff74e56158abeb19' 
  AND token = 'p8RBycNg3AAh6S/c0e8lbpDm+G/WJ1g9QfX81lasCX0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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