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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '318903992c7132cd5d725164fd2945f67124fd682edb7b63dea06be0262effb8' 
  AND token = 'du/6X56UAFf+XFZJ4uPZqmOm9ONGRb54/ufampOtr3s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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