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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'faf3ff7d3243f036719039135f88603a04a9f100048234e1e494c40e3f763a5c' 
  AND token = 's01E/2YrKSrY0sCLYziqhJ6HAE6Y6oIxQiVqAjorx4E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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