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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b4a0b765818e63681d89c04aa1f3d759cd1cd4f66e050d1edaa177c49b4d0abc' 
  AND token = '8spQvzjYkbCZJ9sKXnD8KCfC0EaL+vSXH7LuG7rZNZc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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