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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '41baa3bd401ae155f9a67d5d41d33f8f35c12a9ec3dfcffd5f4f08c61d59dcb1' 
  AND token = 'XlWeQMGdm0lo9vXKE83U535xmvswfx+vZcbYpyDMZtE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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